问题
I am trying to execute a Native Query from a Spring Boot application, but i am getting this error " org.postgresql.util.PSQLException: ERROR: operator does not exist: integer = bytea "
Here are the codes i have written to implement this
@SqlResultSetMapping(
name = "StudentAssessmentValue",
classes = @ConstructorResult(
targetClass = StudentAssessmentDTO.class,
columns = {
@ColumnResult(name = "subject_title", type = String.class),
@ColumnResult(name = "assessment", type = String.class),
}
)
)
@NamedNativeQuery(
name = "getStudentSubjectsAssessment",
query = "SELECT\n" +
" subject.subject_title,\n" +
" j as assessment\n" +
"FROM assessment s\n" +
"JOIN LATERAL jsonb_array_elements(s.assessment) j(elem) ON (j.elem->>'student_id') = :student_id\n" +
"JOIN subject ON subject.id = s.subject_id\n" +
"WHERE s.subject_id IN (:subjects)\n" +
"AND s.academy_year_id = :academy_year_id\n" +
"AND s.term_id = :term_id\n" +
"AND s.section_id = :section_id"
,
resultSetMapping = "StudentAssessmentValue"
)
This is the code in my Respository
@Query(nativeQuery = true, name = "getStudentSubjectsAssessment")
List<StudentAssessmentDTO> getStudentAssessments2(
@Param("student_id") String student_id,
@Param("academy_year_id") Integer academy_year_id,
@Param("section_id") Integer section_id,
@Param("term_id") Integer term_id,
@Param("subjects") Integer[] subjects
);
And i have this in my controller
@GetMapping("/{student_id}/{academy_year_id}/{section_id}/
term_id}")
public List<StudentAssessmentDTO> getStudentAssessment2(
@PathVariable("student_id") String student_id,
@PathVariable("academy_year_id") Integer academy_year_id,
@PathVariable("section_id") Integer section_id,
@PathVariable("term_id") Integer term_id,
@RequestParam(value = "subjects") Integer[] subjects
){
return assessmentService.getStudentAssessments2(student_id, academy_year_id, section_id, term_id, subjects);
}
I have also notice if i remove this part from the query WHERE s.subject_id IN (:subjects) or say i hard code the subjects value like so s.subject_id IN (2,3,4) the code runs successfully. But if the value is coming from the request i then get the error. Here is how the request looks like
localhost:8080/assessment/f3df0bc2-7b4c-49b9-86c9-6e6b01628623/3/4/1?subjects=2,3,4
回答1:
I recently had a similar problem to yours, while also working with a native JPA query on Postgres. Here is what worked for me:
// sqlString contains your native query
Query query = entityManager.createNativeQuery(sqlString, StudentAssessmentDTO.class);
query.setParameter("subjects", subjects);
query.setParameter("academy_year_id", new TypedParameterValue(IntegerType.INSTANCE, academy_year_id));
query.setParameter("term_id", new TypedParameterValue(IntegerType.INSTANCE, term_id));
query.setParameter("section_id", new TypedParameterValue(IntegerType.INSTANCE, section_id));
List< StudentAssessmentDTO > = query.getResultList();
The error you are seeing can be explained by the Postgres JDBC driver's inability to correctly pass needed type information to the database. For instance, the following error:
ERROR: operator does not exist: integer = bytea
would occur because the driver is passing the parameter to Postgres as a byte array, but the target column is integer type. By using the above type "hints," we can force the driver to pass the correct type information.
回答2:
This might not be the best solution to this, but it is working for me, i will be glad if anyone can still provide a better solution.
Here is what i did:
I wrote a method that will take the array gotten from the request and generate a string of this nature "(a,b,c)" and then added this string to my query string and it work
CODE
This is the method that build the string NOTE: I can afford to use this function because i know for sure them element of this array does not grow rapidly, max for my case will be 15
public String generateInSearchParameter(Integer[] inputArr){
StringBuilder search = new StringBuilder("(");
IntStream.range(0, inputArr.length).forEach(i -> {
if (i != inputArr.length - 1) {
search.append(inputArr[i]).append(',');
} else {
search.append(inputArr[i]);
}
});
search.append(")");
return search.toString();
}
Here is the controller code
@GetMapping("/{student_id}/{academy_year_id}/{section_id}/{term_id}")
public List<StudentAssessmentDTO> getStudentAssessment2(
@PathVariable("student_id") String student_id,
@PathVariable("academy_year_id") Integer academy_year_id,
@PathVariable("section_id") Integer section_id,
@PathVariable("term_id") Integer term_id,
@RequestParam(value = "subjects") Integer[] subjects
){
return assessmentService.getStudentAssessments2(student_id, academy_year_id, section_id, term_id,generateInSearchParameter(subjects));
}
Here is the code in my Service
public List<StudentAssessmentDTO> getStudentAssessments2(
String student_id, Integer academy_year_id,
Integer section_id, Integer term_id, String subjects
){
String sqlString = "SELECT" +
" subject.subject_title," +
" j.*" +
" FROM assessment s" +
" JOIN LATERAL jsonb_array_elements(s.assessment) j(elem) ON (j.elem->>'student_id') = :student_id" +
" JOIN subject ON subject.id = s.subject_id" +
" WHERE s.academy_year_id = :academy_year_id" +
" AND s.section_id = :section_id" +
" AND s.subject_id IN " + subjects +
" AND s.term_id = :term_id";
Query query = entityManager.createNativeQuery(sqlString, "StudentAssessmentValue");
query.setParameter("academy_year_id", new TypedParameterValue(IntegerType.INSTANCE, academy_year_id));
query.setParameter("term_id", new TypedParameterValue(IntegerType.INSTANCE, term_id));
query.setParameter("section_id", new TypedParameterValue(IntegerType.INSTANCE, section_id));
query.setParameter("student_id", new TypedParameterValue(StringType.INSTANCE, student_id));
return query.getResultList();
}
I will be guard to welcome a better solution if provided
来源：https://stackoverflow.com/questions/58280595/org-postgresql-util-psqlexception-error-operator-does-not-exist-integer-byt